MESON Chess Problem Database

Problem Display
PID: 273440 (4R3/5p1Q/4np2/1K1NBr1p/2PPk1nR/2P5/5pP1/5B2 w - - 0 1)

Easter, Norris

British Chess Magazine, 1934

4R3/5p1Q/4np2/1K1NBr1p/2PPk1nR/2P5/5pP1/5B2

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd4+
      • 2.Bxd4#
    • 1...Sc7+
      • 2.Bxc7#
  • Tries
    • 1.Rxg4+?
      • 1...Sf4
        • 2.Bxf4#
        • 2.Bd6#
        • 2.Bxf6#
        • 2.Bc7#
        • 2.Bb8#
        • 2.Rxf4#
      • 1...hxg4!
    • 1.Rxe6?
      • 1...fxe5
        • 2.Rxe5#
      • 1...fxe6!
  • Keys
    • 1.Bf4!
      • 1...Sh2
        • 2.Bxh2#
      • 1...Se3
        • 2.Bxe3#
      • 1...Se5
        • 2.Sxf6#
      • 1...Sh6
        • 2.Bxh6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(f);CHECK,OGATE,XP(E)::R(K)+B(I),XS(f)
    • S(f);CHECK,OGATEB::R(K)+B(I),XS(f)
  • Tries
    • Try
      • R(F);CHECK,XS(c)
      • Refutation
        • P(e);XR(F)
    • Try
      • R(K);XS(f)
      • Vars
        • P(g);OGATE,P_SPINP(g),XB(I)::R1(K),XP(g)
      • Refutation
        • P(h);XR(K)
  • Actual
    • B(I);N_PINS(c),P_PINS(f),P_SPINS(H)
    • Vars
      • S(c);OGATEB::R(F)+B(I),XS(c)
      • S(c);N_PINS(H),N_SPINS(f)::S(H),XP(g)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).